Optical lens

Abstract

The application provides an optical lens which is composed of seven lenses and sequentially comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with positive optical power, the object side of which is a convex surface and the image side of which is a convex surface; a fourth lens with positive optical power, the object side of which is a convex surface and the image side of which is a convex surface; a fifth lens with positive optical power, the object side of which is a convex surface and the image side of which is a convex surface; a sixth lens with negative optical power, the object side of which is a concave surface and the image side of which is a convex surface; and a seventh lens with positive optical power, the object side of which is a convex surface and the image side of which is a concave surface. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration and improve the imaging quality of the optical lens through specific surface shape matching and reasonable optical power distribution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND

[0002] With the increasing demand for driving experience, vehicle application type optical lenses are increasingly used in intelligent driving, and vehicle optical lenses are continuously improving in the automotive industry. In the field of vehicle driving, in order to improve the driving safety and intelligence of vehicles, it is necessary to monitor the vehicle cabin, and the OMS (Occupant Monitoring) vehicle lens has rapidly developed. The existing vehicle cabin monitoring lens generally has a resolution of about 1M or 2M, and as the FOV of the lens increases, the angular resolution and resolution decrease sharply. In addition to the requirements of light and thin shape and small front aperture for the optical lens of the OMS system, the optical lens also requires high pixel and high resolution, and can clearly image under low illumination conditions, so it is necessary to develop an optical lens with good imaging effect. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens with excellent imaging quality.

[0004] The technical scheme adopted by the present application is:

[0005] An optical lens composed of seven lenses, including, along the optical axis from the object side to the imaging surface:

[0006] The first lens has negative focal power, the object side surface is convex, and the image side surface is concave;

[0007] The second lens has negative focal power, the object side surface is convex, and the image side surface is concave;

[0008] The third lens has positive focal power, the object side surface is convex, and the image side surface is convex;

[0009] The fourth lens has positive focal power, the object side surface is convex, and the image side surface is convex;

[0010] The fifth lens has positive focal power, the object side surface is convex, and the image side surface is convex;

[0011] The sixth lens has negative focal power, the object side surface is concave, and the image side surface is convex;

[0012] The seventh lens has positive focal power, the object side surface is convex, and the image side surface is concave;

[0013] Wherein, the image side surface curvature radius R6 of the third lens and the object side surface curvature radius R7 of the fourth lens satisfy: 0.2<(R6+R7) / (R6-R7)<1.

[0014] It is further preferred that the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.7 < TTL / f < 7; the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.3 < TTL / IH < 2.8.

[0015] It is further preferred that the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.3 < IH / EPD < 6; the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < IH / f < 2.9.

[0016] It is further preferred that the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.1 < f1 / f < -1.7; the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.8 < f5 / f < 1.

[0017] It is further preferred that the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 6.8 < f3 / f < 9; the object side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: 4.7 < R5 / f < 8.3; the image side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -80 < R6 / f < -16.

[0018] It is further preferred that the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: 1 < f1234 / f567 < 1.3; the image side surface curvature radius R12 of the sixth lens and the image side surface curvature radius R14 of the seventh lens satisfy: 0.4 < (R12+R14) / (R12-R14) < 0.9.

[0019] It is further preferred that the focal length f4 of the fourth lens and the focal length f6 of the sixth lens satisfy: -2.85 < f4 / f6 < -2.2; the effective focal length f of the optical lens and the object side surface curvature radius R7 of the fourth lens satisfy: 6.3 < R7 / f < 8.8; the effective focal length f of the optical lens and the image side surface curvature radius R12 of the sixth lens satisfy: -7.2 < R12 / f < -4.7.

[0020] It is further preferred that the focal length f2 of the second lens and the focal length f7 of the seventh lens satisfy: -1.4 < f2 / f7 < -1; the effective focal length f of the optical lens and the radius of curvature R3 on the object side of the second lens satisfy: 0.9 < R3 / f < 1.1; and the effective focal length f of the optical lens and the radius of curvature R14 on the image side of the seventh lens satisfy: 1 < R14 / f < 1.3.

[0021] It is further preferred that the radius of curvature R5 on the object side of the third lens and the radius of curvature R6 on the image side of the third lens satisfy: -1 < (R5+R6) / (R5-R6) < -0.2; and the radius of curvature R7 on the object side of the fourth lens and the radius of curvature R8 on the image side of the fourth lens satisfy: 0.3 < (R7+R8) / (R7-R8) < 0.8.

[0022] It is further preferred that the radius of curvature R11 on the object side of the sixth lens and the radius of curvature R12 on the image side of the sixth lens satisfy: -1.4 < (R11+R12) / (R11-R12) < -1; and the radius of curvature R13 on the object side of the seventh lens and the radius of curvature R14 on the image side of the seventh lens satisfy: -7.6 < (R13+R14) / (R13-R14) < -5.

[0023] Compared with the prior art, the optical lens provided by the application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of super wide angle, large aperture, miniaturization, high pixel, etc. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0025] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0026] Figure 2 FIG. 2 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0027] Figure 3 FIG. 3 is an F-Theta distortion curve of the optical lens according to the embodiment of the present application.

[0028] Figure 4 FIG. 4 is an axial aberration curve of the optical lens according to the embodiment of the present application.

[0029] Figure 5 FIG. 5 is a transverse chromatic aberration curve of the optical lens according to the embodiment of the present application.

[0030] Figure 6 MTF curve of the optical lens in Embodiment 1 of the present application.

[0031] Figure 7 Structure diagram of the optical lens in Embodiment 2 of the present application.

[0032] Figure 8 Field curve of the optical lens in Embodiment 2 of the present application.

[0033] Figure 9 F-Theta distortion curve of the optical lens in Embodiment 2 of the present application.

[0034] Figure 10 Axial aberration curve of the optical lens in Embodiment 2 of the present application.

[0035] Figure 11 Vignetting curve of the optical lens in Embodiment 2 of the present application.

[0036] Figure 12 MTF curve of the optical lens in Embodiment 2 of the present application.

[0037] Figure 13 Structure diagram of the optical lens in Embodiment 3 of the present application.

[0038] Figure 14 Field curve of the optical lens in Embodiment 3 of the present application.

[0039] Figure 15 F-Theta distortion curve of the optical lens in Embodiment 3 of the present application.

[0040] Figure 16 Axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0041] Figure 17 Vignetting curve of the optical lens in Embodiment 3 of the present application.

[0042] Figure 18 MTF curve of the optical lens in Embodiment 3 of the present application.

[0043] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0044] For a better understanding of the present application, various aspects of the present application will be presented in more detail by referring to the attached drawings. It should be understood that these detailed descriptions are merely descriptive of the embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] It should be noted that the expressions first, second, third and the like in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens without departing from the teachings of the present application.

[0046] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0047] In this specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0048] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. Furthermore, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0049] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0050] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0051] The optical lens provided by the embodiment of the present application is composed of seven lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.

[0052] In some embodiments, the first lens can have a negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The second lens can have a negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The third lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface. The fourth lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface. The fifth lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface. The sixth lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface. The seventh lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface.

[0053] In some embodiments, the optical lens can further include a diaphragm, which can be located between the fourth lens and the fifth lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. When the diaphragm is located between the fourth lens and the fifth lens, the correction of the diaphragm aberration is facilitated.

[0054] In some embodiments, the optical lens can further include a filter, which can be arranged between the seventh lens and the imaging surface. The filter is used to filter out the interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting the normal imaging.

[0055] In some embodiments, the fifth lens and the sixth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to eccentricity, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0056] In some embodiments, the image side surface curvature radius R6 of the third lens and the object side surface curvature radius R7 of the fourth lens satisfy: 0.2<(R6+R7) / (R6-R7)<1. Satisfying the above range can reduce the light deflection angle, make the light trend more stable, and be conducive to the correction of various aberrations of the optical lens, thereby improving the imaging quality of the optical lens. More specifically, 0.42<(R6+R7) / (R6-R7)<0.81.

[0057] In some embodiments, the optical total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.7 < TTL / f < 7. Satisfying the above range can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens. More specifically, 6.36 < TTL / f < 6.7.

[0058] In some embodiments, the optical total track length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of view of the optical lens satisfy: 2.3 < TTL / IH < 2.8. Satisfying the above range ensures that the lens has a larger image surface under the condition of the same total length, which can match a larger size imaging chip to realize high-definition imaging, and better realize the balance between the small total length and the large image surface of the lens. More specifically, 2.5 < TTL / IH < 2.63.

[0059] In some embodiments, the real image height IH corresponding to the maximum field angle of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.3 < IH / EPD < 6. Satisfying the above range can increase the width of the light beam entering the optical lens, so that the brightness of the optical lens at the image surface is improved to avoid dark corners. More specifically, 4.73 < IH / EPD < 5.45.

[0060] In some embodiments, the real image height IH corresponding to the maximum field angle of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < IH / f < 2.9. Satisfying the above range controls the image height and focal length of the optical lens within a reasonable range, which helps the optical lens to have the characteristics of a large image surface and improves the imaging quality. More specifically, 2.42 < IH / f < 2.68.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.1 < f1 / f < -1.7. Satisfying the above range, by setting the first lens to have negative refractive power, the first lens can accommodate a larger angle of light and collect as much light as possible into the rear optical system, thereby realizing a large field of view while increasing the light flux. More specifically, -1.96 < f1 / f < -1.91.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.8 < f5 / f < 1. Satisfying the above condition, by setting the fifth lens to have positive refractive power, the light can be converged while the field curvature and distortion of the optical lens are corrected, thereby improving the imaging quality of the optical lens. More specifically, 0.85 < f5 / f < 0.94.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 6.8 < f3 / f < 9; the object-side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: 4.7 < R5 / f < 8.3; and the image-side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -80 < R6 / f < -16. Satisfying the above ranges is conducive to further convergence of light rays, smooth entry of divergent light rays into a rear optical system, and better implementation of high-quality imaging of the lens; meanwhile, it can effectively correct distortion of an edge field of view, reduce the degree of deformation of an edge of a captured image, and improve image quality. More specifically, 7.56 < f3 / f < 8.24; 5.2 < R5 / f < 7.48; and -73.62 < R6 / f < -17.69.

[0064] In some embodiments, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens, and the seventh lens satisfy: 1 < f1234 / f567 < 1.3. Satisfying the above range is conducive to balancing various aberrations of the system and improving overall imaging quality by reasonably setting the lens group relationship before and after the stop. More specifically, 1.08 < f1234 / f567 < 1.21.

[0065] In some embodiments, the image-side surface curvature radius R12 of the sixth lens and the image-side surface curvature radius R14 of the seventh lens satisfy: 0.4 < (R12+R14) / (R12-R14) < 0.9. Satisfying the above range can reduce the light deflection angle, make the light trend more stable, correct coma and field curvature, improve the flatness of imaging, and improve the imaging quality of the optical lens. More specifically, 0.65 < (R12+R14) / (R12-R14) < 0.71.

[0066] In some embodiments, the focal length f4 of the fourth lens and the focal length f6 of the sixth lens satisfy: -2.85 < f4 / f6 < -2.2; the effective focal length f of the optical lens and the object-side surface curvature radius R7 of the fourth lens satisfy: 6.3 < R7 / f < 8.8; and the effective focal length f of the optical lens and the image-side surface curvature radius R12 of the sixth lens satisfy: -7.2 < R12 / f < -4.7. Satisfying the above ranges is conducive to obtaining a symmetric surface type of the object-side surface of the fourth lens and the image-side surface of the sixth lens, correcting various aberrations of the optical lens, and improving the imaging quality of the optical lens. More specifically, -2.6 < f4 / f6 < -2.42; 6.97 < R7 / f < 8.02; and -6.6 < R12 / f < -5.21.

[0067] In some embodiments, the focal length f2 of the second lens and the focal length f7 of the seventh lens satisfy -1.4 < f2 / f7 < -1; the effective focal length f of the optical lens and the radius of curvature R3 on the object side of the second lens satisfy 0.9 < R3 / f < 1.1; and the effective focal length f of the optical lens and the radius of curvature R14 on the image side of the seventh lens satisfy 1 < R14 / f < 1.3. When the above ranges are met, the lens shape on the object side of the second lens and the lens shape on the image side of the seventh lens are close to concentric circles, which can effectively reduce the optical path difference between the center and the periphery of the lens, and is beneficial to correcting the distortion of the optical lens. More specifically, -1.27 < f2 / f7 < -1.15; 0.95 < R3 / f < 1.03; and 1.06 < R14 / f < 1.21.

[0068] In some embodiments, the radius of curvature R5 on the object side of the third lens and the radius of curvature R6 on the image side of the third lens satisfy -1 < (R5+R6) / (R5-R6) < -0.2. When the above range is met, the light rays are further converged, the divergent light rays smoothly enter the rear optical system, and high-quality imaging of the lens is better achieved; and the distortion of the edge field is effectively corrected, the deformation degree of the edge of the captured image is reduced, and the image quality is improved. More specifically, -0.88 < (R5+R6) / (R5-R6) < -0.4.

[0069] In some embodiments, the radius of curvature R7 on the object side of the fourth lens and the radius of curvature R8 on the image side of the fourth lens satisfy 0.3 < (R7+R8) / (R7-R8) < 0.8. When the above range is met, the light rays are smoothly transitioned, the distortion of the edge field is effectively corrected, the deformation degree of the edge of the captured image is reduced, and the image quality is improved. More specifically, 0.55 < (R7+R8) / (R7-R8) < 0.63.

[0070] In some embodiments, the radius of curvature R11 on the object side of the sixth lens and the radius of curvature R12 on the image side of the sixth lens satisfy -1.4 < (R11+R12) / (R11-R12) < -1. When the above range is met, the surface shape of the sixth lens is controlled, which is beneficial to increasing the imaging area and the field angle of the optical lens, balancing the aberration of the optical lens, and improving the imaging quality of the optical lens. More specifically, -1.21 < (R11-R12) / (R11+R12) < -1.15.

[0071] In some embodiments, the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: -7.6 < (R13+R14) / (R13-R14) < -5. The satisfaction of the above range defines the seventh lens to have a suitable surface shape, to smoothly transit the light ray trend to the rear, to reduce the height of the light ray incident to the rear, to slow down the upward trend of the light ray, to avoid the light energy loss caused by the excessively large angle between the main light ray and the chip when the light ray of the large field of view reaches the imaging surface, to facilitate the improvement of the illumination of the edge field of view, and to facilitate the realization of a short total optical length. More specifically, -6.91 < (R13-R14) / (R13+R14) < -5.61.

[0072] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 70° < FOV / Fno < 80°. The satisfaction of the above range defines the optical lens to have a suitable field of view and aperture value, to be able to collect light rays of a large angle and to obtain good imaging quality. More specifically, 73.15° < FOV / Fno < 74.43°.

[0073] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.4 < BFL / f < 0.6. The satisfaction of the above range defines the optical lens to have a suitable back focus, to facilitate the reasonable arrangement of the positions of the lenses, and to reduce the processing and assembly difficulty. More specifically, 0.48 < BFL / f < 0.55.

[0074] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 50° < (f x FOV) / IH < 65°. The satisfaction of the above range reasonably limits the relationship among the focal length, the field of view, and the image height of the optical lens, to ensure that the optical lens has a large field of view and a large image surface, thereby making the optical lens have good optical performance and being able to capture the details of the object well. More specifically, 56.57° < (f x FOV) / IH < 59.61°.

[0075] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.5 < ∑CT / TTL < 0.6. The satisfaction of the above range can effectively compress the total length of the optical lens, and is beneficial to the structural design and production process of the optical lens. More specifically, 0.55 < ∑CT / TTL < 0.58.

[0076] In some embodiments, the effective focal length f of the optical lens, the radian θ of the maximum half field angle, and the real image height IH corresponding to the maximum field angle satisfy: 0.95 < (IH / 2) / (f x θ) < 1.02. Satisfying the above range is conducive to achieving the ultra-wide-angle characteristics of the optical lens, and the optical lens can have a smaller distortion.

[0077] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4.3 < f2 / f < -3.4. Satisfying the above range controls the second lens to have a suitable negative refractive power, which can share the negative refractive power of the front end of the optical lens, thereby helping to avoid excessive deflection of light caused by the first lens having too concentrated refractive power, and reducing the difficulty of chromatic aberration correction of the optical lens. More specifically, -3.94 < f2 / f < -3.75.

[0078] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.9 < f4 / f < 2.4. Satisfying the above range can effectively converge light, reduce the difficulty of edge field distortion correction, ensure that the lens has a smaller distortion while achieving a large field angle, and improve the overall imaging quality. More specifically, 2.13 < f4 / f < 2.17.

[0079] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1 < f6 / f < -0.7. Satisfying the above range can effectively balance various aberrations generated by the front lens group, while helping to increase the degree of divergence of light, increase the area of light entering the imaging surface, achieve large target surface imaging of the lens, and improve the imaging quality of the optical lens. More specifically, -0.9 < f6 / f < -0.82.

[0080] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 2.8 < f7 / f < 3.6. Satisfying the above range can make the seventh lens have a suitable positive refractive power, which is conducive to balancing the astigmatism of the optical lens and improving the imaging quality of the optical lens. More specifically, 3.12 < f7 / f < 3.25.

[0081] In some embodiments, the sagittal height Sag3 of the half light entrance radius of the object side of the second lens and the half light entrance radius d3 of the object side of the second lens satisfy: 0.2 < Sag3 / d3 < 0.3; the sagittal height Sag14 of the half light entrance radius of the image side of the seventh lens and the half light entrance radius d14 of the image side of the seventh lens satisfy: 0.2 < Sag14 / d14 < 0.4. Satisfying the above range helps to control the trend of the edge field light, and highlights the center field detail information of the optical lens. More specifically, 0.22 < Sag3 / d3 < 0.27; 0.26 < Sag14 / d14 < 0.34.

[0082] In some embodiments, the optical lens satisfies the condition formula: 2mm < f < 2.5mm, 1mm < EPD < 1.3mm, 14mm < TTL < 16mm, 1.8 < Fno < 2.2, 14.3° < CRA < 19.2°, 1mm < BFL < 1.4mm, 130° < FOV < 160°, 5mm < IH < 6.5mm; wherein f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence at the maximum image height of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the real image height corresponding to the maximum field of view angle of the optical lens. Satisfying the above condition indicates that the optical lens provided by the embodiments of the present application at least has the characteristics of miniaturization, large target surface, large field of view angle, large aperture, etc. More specifically, 2.23mm < f < 2.29mm, 1.09mm < EPD < 1.18mm, 14.5mm < TTL < 15.01mm, 1.94 < Fno < 2.06, 15.79° < CRA < 17.5°, 1.11mm < BFL < 1.24mm, 144° < FOV < 151°, 5.53mm < IH < 5.99mm.

[0083] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. In the optical lens provided by the present application, the first lens and the fourth lens are glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses. The optical lens of the present application adopts a glass-plastic hybrid structure to improve the thermal stability.

[0084] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can adopt a spherical lens or an aspherical lens. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens and the fourth lens of the present application adopt a spherical lens, and the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens all adopt an aspherical lens, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization.

[0085] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0086]

[0087] wherein z is the distance of the curved surface to the vertex of the curved surface in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the coefficient of the quadratic curved surface, and B, C, D, E, and F are the coefficients of the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order curved surfaces, respectively.

[0088] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are merely the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, substitution, combination, or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and all are included in the protection scope of the application.

[0089] Embodiment 1

[0090] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application. The optical lens comprises, in sequence from the object side to the imaging surface along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0091] The first lens L1 has negative focal power, the object side surface S1 thereof is a convex surface, and the image side surface S2 thereof is a concave surface;

[0092] The second lens L2 has negative focal power, the object side surface S3 thereof is a convex surface, and the image side surface S4 thereof is a concave surface;

[0093] The third lens L3 has positive focal power, the object side surface S5 thereof is a convex surface, and the image side surface S6 thereof is a convex surface;

[0094] The fourth lens L4 has positive focal power, the object side surface S7 thereof is a convex surface, and the image side surface S8 thereof is a convex surface;

[0095] The fifth lens L5 has positive focal power, the object side surface S9 thereof is a convex surface, and the image side surface S10 thereof is a convex surface;

[0096] The sixth lens L6 has negative focal power, the object side surface S10 thereof is a concave surface, and the image side surface S11 thereof is a convex surface;

[0097] The fifth lens L5 and the sixth lens L6 form a cemented lens group with positive focal power, that is, the cemented surface of the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0098] The seventh lens L7 has positive refractive power, the object side surface S12 is a convex surface, and the image side surface S13 is a concave surface;

[0099] The object side surface S14 and the image side surface S15 of the filter G1 are both planar surfaces;

[0100] The imaging surface S16 is a planar surface.

[0101] The first lens L1 and the fourth lens L4 are glass spherical lenses, and the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses.

[0102] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0103] Table 1-1

[0104]

[0105]

[0106] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0107] Table 1-2

[0108] Face number K B C D E F S3 -3.75E+00 4.45E-03 -6.89E-03 9.32E-04 1.92E-05 -8.22E-06 S4 -1.06E+00 -1.28E-02 2.68E-03 -3.58E-03 1.04E-03 -8.53E-05 S5 6.23E+01 5.48E-03 -1.73E-03 2.61E-05 -2.92E-04 5.13E-05 S6 -4.50E+01 3.50E-03 -1.85E-03 3.10E-04 -2.08E-04 3.72E-05 S9 8.61E+00 -2.51E-03 5.33E-04 -5.79E-04 1.50E-04 -3.22E-05 S10 -3.94E+00 -1.62E-01 7.11E-02 -2.32E-02 4.31E-03 -3.04E-04 S11 -6.86E+01 -3.63E-02 1.18E-02 -2.11E-03 2.22E-04 -9.08E-06 S12 -3.47E+00 9.47E-03 -2.42E-03 1.73E-04 1.89E-06 -1.57E-06 S13 -9.86E-01 2.02E-03 -4.19E-03 7.88E-04 -8.11E-05 2.85E-06

[0109] Figure 2 A field curvature curve of the optical lens 100 in the embodiment is shown, which represents the bending degree of the light rays on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.06 mm, which shows that the optical lens 100 can better correct the field curvature.

[0110] Figure 3 An F-Theta distortion curve of the optical lens 100 in the embodiment is shown, which represents the distortion of different field angles on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the distortion value is controlled within ±2%, which shows that the optical lens 100 can better correct the distortion.

[0111] Figure 4 An axial aberration curve of the optical lens 100 in the embodiment is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±0.02 mm, which shows that the optical lens 100 can better correct the axial aberration.

[0112] Figure 5 The axial chromatic aberration curve of the optical lens 100 in this embodiment is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging surface relative to the central wavelength (0.555 μm), the horizontal axis represents the axial chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±6 μm, which shows that the optical lens 100 can better correct chromatic aberration.

[0113] Figure 6 The modulation transfer function (MTF) curve of the optical lens 100 in this embodiment is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of this embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0114] Embodiment 2

[0115] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens 200 provided in the embodiment 2 of the present application. Compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0116] The related parameters of each lens in the optical lens 200 in the embodiment 2 are shown in Table 2-1.

[0117] Table 2-1

[0118]

[0119] The surface type parameters of the aspherical lens of the optical lens 200 in the embodiment 2 are shown in Table 2-2.

[0120] Table 2-2

[0121] Face number K B C D E F S3 -3.52E+00 4.76E-03 -6.84E-03 9.17E-04 1.62E-05 -5.87E-06 S4 -1.08E+00 -1.38E-02 1.61E-03 -3.93E-03 1.01E-03 -9.01E-05 S5 1.24E+01 3.41E-03 -2.11E-03 -3.25E-04 -4.14E-04 7.76E-05 S6 -1.65E+02 3.17E-03 -2.23E-03 3.16E-04 -1.91E-04 3.82E-05 S9 9.20E+00 -1.95E-03 3.84E-04 -6.70E-04 1.74E-04 -3.15E-05 S10 -3.30E+00 -1.63E-01 7.22E-02 -2.27E-02 4.39E-03 -3.52E-04 S11 -7.65E+01 -3.51E-02 1.17E-02 -2.13E-03 2.25E-04 -9.45E-06 S12 -2.98E+00 8.24E-03 -2.48E-03 1.86E-04 7.99E-07 -1.69E-06 S13 -1.20E+00 1.11E-03 -3.98E-03 7.67E-04 -8.27E-05 3.01E-06

[0122] In this embodiment, the field curvature curve, the F-Theta distortion curve, the axial aberration curve, the axial chromatic aberration curve and the MTF curve of the optical lens 200 are shown in Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 respectively.

[0123] From Figure 8It can be seen from the above table that the field curvature of the sagittal image plane and the tangential image plane is controlled within ±0.05 mm, which indicates that the optical lens 200 can better correct the field curvature.

[0124] From the above table, it can be seen that the distortion value is controlled within ±4%, which indicates that the optical lens 200 can better correct the distortion. Figure 9

[0125] From the above table, it can be seen that the shift of the axial aberration is controlled within ±0.05 mm, which indicates that the optical lens 200 can better correct the axial aberration. Figure 10 From the above table, it can be seen that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±5 μm, which indicates that the optical lens 200 can better correct the chromatic aberration.

[0126] Figure 11 From the above table, it can be seen that the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0127] From the above table, it can be seen that the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency. Figure 12 Embodiment 3

[0128] Please refer to Fig. 3, which is a structural schematic diagram of the optical lens 300 provided in the embodiment 3 of the present application, and the main difference between the embodiment and the embodiment 1 is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0129] Figure 13 The related parameters of each lens in the optical lens 300 in the embodiment 3 are shown in Table 3-1.

[0130] Table 3-1

[0131] Table 3-1

[0132]

[0133]

[0134] The surface type parameters of the aspherical lens of the optical lens 300 in the embodiment 3 are shown in Table 3-2.

[0135] Table 3-2

[0136] Face number K B C D E F S3 -3.95E+00 4.62E-03 -6.85E-03 9.40E-04 2.26E-05 -7.61E-06 S4 -1.09E+00 -1.41E-02 2.21E-03 -3.72E-03 1.02E-03 -8.87E-05 S5 5.12E+01 5.07E-03 -1.97E-03 -6.03E-05 -3.12E-04 5.27E-05 S6 -1.14E+02 3.73E-03 -1.63E-03 3.92E-04 -1.97E-04 3.24E-05 S9 9.30E+00 -1.47E-03 4.17E-04 -6.62E-04 1.70E-04 -3.68E-05 S10 -3.44E+00 -1.68E-01 7.11E-02 -2.28E-02 4.49E-03 -3.29E-04 S11 -9.08E+01 -3.56E-02 1.18E-02 -2.11E-03 2.22E-04 -8.65E-06 S12 -3.21E+00 8.00E-03 -2.34E-03 1.70E-04 1.11E-06 -1.49E-06 S13 -1.07E+00 1.67E-03 -4.22E-03 7.82E-04 -8.13E-05 2.94E-06

[0137] In the embodiment, the field curvature curve, the F-Theta distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF curve of the optical lens 300 are respectively as shown in Figure 14 、 Figure 15 ,​​​Figure 16 , Figure 17 , Figure 18 .

[0138] From the Figure 14 , it can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.06 mm, which indicates that the optical lens 300 can better correct the field curvature.

[0139] From the Figure 15 , it can be seen that the distortion value is controlled within ±4%, which indicates that the optical lens 300 can better correct the distortion.

[0140] From the Figure 16 , it can be seen that the offset of the axial aberration is controlled within ±0.05 mm, which indicates that the optical lens 300 can better correct the axial aberration.

[0141] From the Figure 17 , it can be seen that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±5 μm, which indicates that the optical lens 300 can better correct the chromatic aberration.

[0142] From the Figure 18 , it can be seen that the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0143] Please refer to Table 4 for the optical properties corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view, the chief ray angle CRA at the maximum image height, the maximum field of view FOV, and the numerical value corresponding to each condition in each embodiment.

[0144] Table 4

[0145]

[0146]

[0147] In summary of the above embodiments, the optical lens provided by the present application adopts seven lenses with specific optical power, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of super wide angle, large aperture, miniaturization, high pixel, etc.

[0148] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0149] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens consisting of seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, successively comprise: a first lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a second lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a third lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a fourth lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a fifth lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a sixth lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a seventh lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; wherein the image side surface curvature radius R6 of the third lens and the object side surface curvature radius R7 of the fourth lens satisfy: 0.2<(R6+R7) / (R6-R7)<1; the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.3<IH / EPD<6; the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.2<IH / f<2.9; the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: 1<f1234 / f567<1.3; the image side surface curvature radius R12 of the sixth lens and the image side surface curvature radius R14 of the seventh lens satisfy: 0.4<(R12+R14) / (R12-R14)<0.

9.

2. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.7<TTL / f<7; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.3<TTL / IH<2.

8.

3. The optical lens of claim 1, wherein, The image side surface curvature radius R6 of the third lens and the object side surface curvature radius R7 of the fourth lens satisfy: 0.42<(R6+R7) / (R6-R7)<0.81; the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.73<IH / EPD<5.45; the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.42<IH / f<2.

68.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.1<f1 / f<-1.7; the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.8<f5 / f<1.

5. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: 6.8 < f3 / f < 9; a radius of curvature R5 of an object side surface of the third lens and the effective focal length f of the optical lens satisfy: 4.7 < R5 / f < 8.3; a radius of curvature R6 of an image side surface of the third lens and the effective focal length f of the optical lens satisfy: -80 < R6 / f < -16.

6. The optical lens of claim 1, wherein, A combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and a combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: 1.08 < f1234 / f567 < 1.21; a radius of curvature R12 of an image side surface of the sixth lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: 0.65 < (R12+R14) / (R12-R14) < 0.

71.

7. The optical lens of claim 1, wherein, A focal length f4 of the fourth lens and a focal length f6 of the sixth lens satisfy: -2.85 < f4 / f6 < -2.2; the effective focal length f of the optical lens and a radius of curvature R7 of an object side surface of the fourth lens satisfy: 6.3 < R7 / f < 8.8; the effective focal length f of the optical lens and a radius of curvature R12 of an image side surface of the sixth lens satisfy: -7.2 < R12 / f < -4.

7.

8. The optical lens of claim 1, wherein, A focal length f2 of the second lens and a focal length f7 of the seventh lens satisfy: -1.4 < f2 / f7 < -1; the effective focal length f of the optical lens and a radius of curvature R3 of an object side surface of the second lens satisfy: 0.9 < R3 / f < 1.1; the effective focal length f of the optical lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: 1 < R14 / f < 1.

3.

9. The optical lens of claim 1, wherein, A radius of curvature R5 of an object side surface of the third lens and a radius of curvature R6 of an image side surface of the third lens satisfy: -1 < (R5+R6) / (R5-R6) < -0.2; a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy: 0.3 < (R7+R8) / (R7-R8) < 0.

8.

10. The optical lens of claim 1, wherein, A radius of curvature R11 of an object side surface of the sixth lens and a radius of curvature R12 of an image side surface of the sixth lens satisfy: -1.4 < (R11+R12) / (R11-R12) < -1; a radius of curvature R13 of an object side surface of the seventh lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: -7.6 < (R13+R14) / (R13-R14) < -5.

Images